diff options
Diffstat (limited to 'py/asmarm.c')
| -rw-r--r-- | py/asmarm.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/py/asmarm.c b/py/asmarm.c index 1a8923bc2..fefe5b15c 100644 --- a/py/asmarm.c +++ b/py/asmarm.c @@ -273,6 +273,21 @@ void asm_arm_mov_reg_local_addr(asm_arm_t *as, uint rd, int local_num) { emit_al(as, asm_arm_op_add_imm(rd, ASM_ARM_REG_SP, local_num << 2)); } +void asm_arm_mov_reg_pcrel(asm_arm_t *as, uint reg_dest, uint label) { + assert(label < as->base.max_num_labels); + mp_uint_t dest = as->base.label_offsets[label]; + mp_int_t rel = dest - as->base.code_offset; + rel -= 12 + 8; // adjust for load of rel, and then PC+8 prefetch of add_reg_reg_reg + + // To load rel int reg_dest, insert immediate into code and jump over it + emit_al(as, 0x59f0000 | (reg_dest << 12)); // ldr rd, [pc] + emit_al(as, 0xa000000); // b pc + emit(as, rel); + + // Do reg_dest += PC + asm_arm_add_reg_reg_reg(as, reg_dest, reg_dest, ASM_ARM_REG_PC); +} + void asm_arm_lsl_reg_reg(asm_arm_t *as, uint rd, uint rs) { // mov rd, rd, lsl rs emit_al(as, 0x1a00010 | (rd << 12) | (rs << 8) | rd); @@ -362,4 +377,8 @@ void asm_arm_bl_ind(asm_arm_t *as, void *fun_ptr, uint fun_id, uint reg_temp) { emit(as, (uint) fun_ptr); } +void asm_arm_bx_reg(asm_arm_t *as, uint reg_src) { + emit_al(as, 0x012fff10 | reg_src); +} + #endif // MICROPY_EMIT_ARM |